It will vary from place to place. Around here (East Central Indiana) they only put down salt (which isn't salt anymore) when there is the chance of freezing precipitation. Otherwise it's just sand.
99 Chevrolet Camaro Z28 M6 - 6.676 @ 103 in 1/8, 10.512 @ 130.2 on street tires, H/C/I
93 Eagle Talon TSI AWD 5spd - Built 6 Bolt, 16G Evo3, HKS 272 Cams - under construction